A cross-dipole technology was used to evaluate a carbonate formation in Southeastern New Mexico to determine fracture trends in a water-flooded environment. The measurements were first made in openhole, then in casedhole before and after fracture stimulation. The cross-dipole data were processed to find the amount of anisotropy and the associated azimuth. The results demonstrate that stimulated fractures create a substantial anisotropy and well-defined azimuth behind casing. More important, by evaluating the anisotropy value and the azimuth from the casedhole data, we can determine the fracture extent along the borehole and its azimuth in the formation. The fracture extent is also consistent with that from a radioactive tracer measurement. The results of this study suggest that cross-dipole acoustic logging is an effective technology for casedhole fracture stimulation evalution.
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